Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus
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Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus. Yuk L. Yung M. C. Liang, California Institute of Technology [email protected] EGU Meeting 2008. Important Processes in the Atmosphere of Venus. Catalytic Chemical Cycles Heterogeneous Chemistry

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Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus

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Chemical sources and sinks of ocs in the lower atmosphere of venus

Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus

Yuk L. Yung

M. C. Liang,

California Institute of Technology

[email protected]

EGU Meeting

2008


Important processes in the atmosphere of venus

Important Processes in the Atmosphere of Venus

  • Catalytic Chemical Cycles

  • Heterogeneous Chemistry

  • Middle Atmosphere Circulation

  • OCS as tracers of chemistry and dynamics


Venus model description

Venus model description

  • Two-dimensional Caltech/JPL KINETICS chemical transport model

  • Solve continuity equation for 24 species with ~200 chemical reactions (subset of Mills’)


Role of circulation

Role of circulation

  • Affect the upward flux of OCS from the surface

  • Reduce OCS abundances at high latitudes


Chemical sources and sinks of ocs in the lower atmosphere of venus

S

hv

S2

S

S3

OCS

S4

CO

hv

hv

S

hv

hv

S2

S3

hv

S4

S8

S4

S


Conclusions

Conclusions

  • Scale height of OCS cannot be explained by photolysis alone

  • Photosensitized dissociation of OCS via polysulfur photochemistry

  • Integrated destruction rate of OCS is 23,000 Tg- S/yr [Earth = 10 Tg-S/yr]


Acknowledgements

Acknowledgements

  • NASA and ESA

  • P. Drossart

  • R. L. Shia

  • K. Baines

  • D. Crisp

  • C. Lee

  • X. Jiang

  • B. Bezard

  • E. Marq


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